文献类型：期刊文献

英文题名：Gravity-driven electrospun membranes for effective removal of perfluoro-organics from synthetic groundwater

作者：Wan, Hongyi[1,3];Mills, Rollie[2];Wang, Yixing[1];Wang, Keyu[1];Xu, Sunjie[1];Bhattacharyya, Dibakar[2];Xu, Zhi[1,3]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[2]Univ Kentucky, Dept Chem & Mat Engn, Lexington, KY 40506 USA;[3]East China Univ Sci & Technol, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2022

卷号：644

外文期刊名：JOURNAL OF MEMBRANE SCIENCE

收录：;EI(收录号：20215111371835);WOS:【SCI-EXPANDED(收录号:WOS:000788497900003)】；

基金：This work was supported by China Postdoctoral Science Foundation [2020M681204]; the National Natural Science Foundation of China [21908054 & 22075076]; and NIEHS-SRP grant [P42ES007380]. We highly appreciate the collaborations with the University of Kentucky NIEHS Superfund center.

语种：英文

外文关键词：Electrospun membranes; PFAS Removal; Removal mechanism; Water treatment; Co-existing competitors

摘要：Perfluoroalkyl and polyfluoroalkyl substances (PFAS) are emerging contaminants in water and soil. Electrospun membranes with open structure could treat PFAS in a gravity-driven mode with ultralow pressure needs. The electrospun ultrathin fibers (67 +/- 27 nm) was prepared for the enhanced specific surface area; where poly-vinylidene fluoride (PVDF) backbones and the grafted quaternary ammonium moieties (QA; PVDF-g-QA mem-branes) provided both hydrophobicity and anion-exchange ability (electrostatic interaction). High affinity towards the perfluorooctanoic acid (PFOA)/perfluorooctanesulfonic acid (PFOS) molecules (denoted as PFOX collectively) was observed, and > 95% PFOX was removed from synthetic groundwater with a flux of 32.3 Lm(-2)h(-1) at delta P-o = 313 Pa. With a higher octanol/water partitioning coefficient (Log K-ow = 6.3) and close dispersion interaction parameter to the membrane backbones (16.6% difference in delta(d)), the effective PFOS removal remained under alkaline and high conductivity conditions due to the intensive hydrophobic interaction compared to that of PFOA. Long-term studies exhibited > 90% PFOX removal in an 8 h test with a capacity of 258 L/m(2). Under mild regeneration conditions, PFOA and PFOS were concentrated by 35-fold and 39-fold, respectively. Overall, the gravity-driven electrospun PVDF-g-QA membranes, with adsorptive effectiveness and ease of regeneration, showed great potential in PFAS remediation.